PROBLEM TO BE SOLVED : To learn the value (ranking) or price of real estate at a glance and to construct a fair and safe market. SOLUTION : The evaluation or ranking of properties is performed on the basis of a reference value by a process (step A) for collecting property information, a process (step B) for performing the evaluation or ranking of the properties, a process (step C) for opening a market on an internet and a process (step D) for executing an auction.